Say we have a pressure control valve which is designed to control the upstream pressure in a line at a certain value say 5 bar. Flow is normally from left to right and the upstream pressure is normally higher than the downstream pressure. Now if the downstream pressure becomes higher than the upstream pressure such that the flow is reversed (ie. from right to left), what is the pressure control valve supposed to do? Does it switch to a downstream controller? Or does it block reverse flow? Or does it just stay fully open?
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